<!DOCTYPE html>
<html>

<head lang='zh'>
	<meta charset='utf-8'>
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
</head>

<body>
	<iframe id="obj1" type="text/html" src="http://localhost:3000/" style="margin:0px;padding:0px;position:absolute;width:100%;height:50%;left: 0px;top: 0px;border: none;">
    </iframe>
	<iframe id="obj2" type="text/html" src="http://localhost:3000/" style="margin:0px;padding:0px;position:absolute;width:100%;height:50%;left: 0px;top: 50%;border: none;">
    </iframe>

</body>

</html>
<script>
  window.testVal = 'a'
  document.querySelector('#obj1')
</script>
